Stopping mechanism for elevator-cars



(No Model.) 2 Sheets-She'et 2.

0. P. ADAMS & E. VAUGHAN.

STOPPING MECHANISM FOR ELEVATOR CARS.

No. 304,771. Patented Sept. 9, 1884.

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UNirn STATES Ararat @rrre CHARLES P. ADAMS, OF STOOKBRIDGE, AND EARL VAUGHAN, OF BOSTON,

' MASSACHUSETTS.

S'fOPPlNG MECHANISM FOR ELEVATOR-CARS.

SPECIFICATION forming part of Letters Patent No. 304,771, dated September 9, 1884.

Application filed February 16, 1884. (No model.)

lb a/ZZ whom it may concern.-

Be it known that we, CHARLES P. AnAMs, a citizen of the United States, residing at Stockbridge, in the county of Berkshire and State of Massachusetts, and EARL VAUGHAN, acitizen of the United States, residing at Boston,

in the county of Suffolk and State of Massachusetts, have invented certain new and'useful Improvements in Stopping Mechanism for Elevator-Cars, of which the following is a full, clear, and exact description.

This invention relates to means for automatically stopping elevator-cars upon their attaining a dangerously-accelerated speed in rising and descending.

The invention consists in the combination, with a suitably-moved ear, of toothed racks in the elevator-well,with which toothed wheels on the car mesh, said wheels also driving pinions on shafts carrying friction-drums, the friction bands or straps of which drums are connected to jointed levers held up by a governor mechanism geared with one of the pinions, which governor mechanism is caused to release the said levers when the speed of the car is dangerously accelerated, and effect the application of the power of the friction-bands to the drums to stop the car, all substantially as hereinafter specified and claimed.

In the accompanying drawings, illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 is a top plan view of the mechanism thereof, omitting the lifting means. Fig. 2 is a front elevation thereof; and Fig. 3 is a side view of part of the governor mechanism, showing one of the friction-levers in crosssection and in position when the car is moving.

The invention is shown applied to the top of a car, a; but it is obvious mere mechanical changes only are necessary to apply it the bottom thereof. usual ways, I), 011 which are secured the toothed racks c. The toothed wheels 02, which mesh with the racks c, are supported on shafts borne by standards 6 on the car, and these wheels mesh with and drive pinions f on shafts 9, supported in standards h, also on the car. The shafts 9 also support drums z', and these drums are encircled by friction bands or straps j, eccentrically connected to the heads of levers 7c The well is provided with the k, fulcrumed to standards Z Z: on the car. The free ends of the levers k k extend toward each other over the center of the car, and are loose jointed by pin or, engaging longitudinal slots at in them, and one or both of said levers is weighted, as by a mass of metal, 0, secured thereon.

In the drawings, lever is is shown as receiving the weight, and its end k extended beyond the joint to the governor, for a purpose presently appearing.

is a counter shaft, suitably supported, having on one end abevel-gear, q, meshing with a beve1-gear,r, on the shaft and said shaft has at its other end a bevel-gear, s, meshing with the bevel-gear t, of a suitable governor, u. The bevel-gear t is arranged to turn the governorshaft 1;, and at the same time'permit a longitudinal movement of such shaft.

On the shaft 12 is a tappet, 10, which, on the descent of the said shaft, strikes the horizon tal end of a trip or bell-crank lever, 00, fulcrumed in a standard g on the car, and another tappet, z, is fast to the shaft 1;, at right angles to the tappet w, and extends over the end of the lever 7:, to depress the jointed 1evers k is. The vertical end of the bell-crank lever is notched at a, to receive and support the levers k is when in their normal position of inactivity. WVhen, however, there is a dangerous acceleration of the speed of the car in ascending or descending, the shaft 1) of the governor is caused to descend, and its tappet w strikes the horizontal end of the bell-crank lever 00, and draws its vertical end from itssupport of the levers k is, allowing the jointed ends of such levers to fall, and as they fall the straps j are tightened about the drums,thereby applying sufficient friction to them to arrest the rotation of the shafts g, and hence the pinions f, and wheels (1, and so stopping the car. The weighting of the levers 7c insures their fall and also sufficient power to fully apply the friction-straps; and so, also, the tappet z, striking the lever end It, would serve to overcome any sticking of the levers at their' joint by reason of rust or disuse.

Any suitable connection with the levers leading into the car will serve to give the attendant in the ear control of the resetting of the levers, by raising them to their normal post tion, to permit the ear to again move. One such connection is here shown as composed of a cord, 1), connected to one of the levers, and leading over pulleys c 0 into the ear, and provided with a handle, (2. By pulling down on this cord when the levers are fallen, they will be raised and the stopping mechanism re set, to permit the ear to move.

Any suitable motive-power may be used for propelling the car, and the invention may be employed in connection with any of the known brake mechanisms to which it is applicable by obvious adaptation.

The invention is in reality a brake for clevator-ears, and as a whole may be so designated.

What we claim is- 1. A mechanism for arresting the dangerously-accelerated movement of an elevatorcar, comprising drums driven by connection with the car-guiding mechanism, levers held normally inactive by connection with a governor, and friction bands encircling said drums and operated by said levers, on the re lease of the levers by a too rapid rotation of the governor, to apply friction to the drums and arrest the movement of the guiding mechanism, and consequently that of the car, substantially as described.

2. The combination, with an elevator-ear, of two lovers loosely connected at their free ends, and a governor mechanism supporting them, friction bands eecentrically connected to said levers, and friction-drums encircled by said bands and driven by gearing with the racks, whereby, as the speed of the car is unduly increased, the governor withdraws its support from the lovers, which then fall and tighten their bands about the friction-drums, and arrest the movement of the drums and the gearing, and hence the car, substantially drawn nearer, friction drums encircled by said bands, their shafts rotated by the move ment of the car, and a governor mechanism normally supporting such levers in a state of inactivity, and driven from the shaft of one of the friction-drums, and mechanism operated by said governor to render the levers op erative to apply friction to the drums and arrest their rotation. substantially as described.

4. The levers 71775 slotted longitudinally,and connected loosely by a pin or bolt passed through said slots, the extension 7v? of lever 7:, a trip-lever engaging said extension to support the levers in inactivity, and the governor rod or shaft provided with means to engage said trip-lever to render the lovers it 7.1 operative, substantially as described.

5. The combination, with a suital lyn'1oved elevator-car, of toothed racks in the well, toothed wheels engaging the same, drums driven from said wheels by pinions on their shafts, meshing with said wheels, i'riction-lmnds on said drums, jointed levers secured to said bands, a governor, geared with one of said pin ions, and mechanism connected with and operated by said governor, to operate said levers to apply the 'friction-lmiuls lo the drums to stop rotation of the gearing, substantially as described.

6. The combination, with an elevator-ear and means to move it up and down its well or shaft, of jointed or connected levers normally inactive, friction-bands attached to and operated by said levers when rendered active, drums to which said friction bands are ap plied, and connected with the car o 'ierating or guiding mechanism, and means to render said levers active to apply the frictionbands to the drums to arrest the ear, substantially as described.

In testimony whereof we have hereunto set our hands this 12th day of February, A. l). 1884.

CHARLES P. ADAM EAR-L VAUGHAN. 

